diff --git a/src/hostapi/wmme/pa_win_wmme.c b/src/hostapi/wmme/pa_win_wmme.c
index 5c56815..09b683f 100644
--- a/src/hostapi/wmme/pa_win_wmme.c
+++ b/src/hostapi/wmme/pa_win_wmme.c
@@ -2417,6 +2417,7 @@ static PaError OpenStream( struct PaUtilHostApiRepresentation *hostApi,
         suggestedInputLatency = 0.;
         inputStreamInfo = 0;
         hostInputSampleFormat = 0;
+        inputChannelMask = 0;
     }
 
 
@@ -2467,6 +2468,7 @@ static PaError OpenStream( struct PaUtilHostApiRepresentation *hostApi,
         outputStreamInfo = 0;
         hostOutputSampleFormat = 0;
         suggestedOutputLatency = 0.;
+        outputChannelMask = 0;
     }